SQL Server: Fix: Transaction (Process ID) was deadlocked on lock | communication buffer resources with another process and has been chosen as the deadlock victim. Rerun the transaction

I have a nightly SQL Agent job that aggregates backup information from system views to power a Power BI dashboard that the DBA's review periodically for database backup failures. It is actually a PowerShell job that runs every night in parallel to collect the data from hundreds of instances (both SQL Server and Oracle). As … Continue reading SQL Server: Fix: Transaction (Process ID) was deadlocked on lock | communication buffer resources with another process and has been chosen as the deadlock victim. Rerun the transaction

PowerShell: Invoke-RDPLogoff – Logoff From Windows Servers In Parallel

Recently, I changed my Windows password and that started a chain of events. My account would get locked out because an invalid password was used and I started getting weird errors in various programs when using the account even after getting it unlocked several times. Restarting my own PC did not help. Then, it occurred … Continue reading PowerShell: Invoke-RDPLogoff – Logoff From Windows Servers In Parallel

PowerShell & SQL Server: Run In Parallel – Collect SQL Results With PRINT Output From Across Your SQL Farm – Fast!

If you have been working with PowerShell and SQL Server for a while now, you know that it is not difficult to capture the PRINT statement output as VERBOSE output (which can then be redirected to a variable or file). You also know that it is not too difficult to run SQL in parallel against … Continue reading PowerShell & SQL Server: Run In Parallel – Collect SQL Results With PRINT Output From Across Your SQL Farm – Fast!

Oracle – Parallel To PGA (P2P) & Serial To SGA (S2S) – Caching Differences And When Parallelism Is Not The Panacea For Performance!

If you are running into memory issues such as below, there could be several causes but one of the causes is excessive parallelism and exhaustion of PGA memory. “ORA-01034: ORACLE not available / ORA-27102: out of memory / Linux-x86_64 Error: 12: Cannot allocate” Please read on to find out how to resolve this. There are … Continue reading Oracle – Parallel To PGA (P2P) & Serial To SGA (S2S) – Caching Differences And When Parallelism Is Not The Panacea For Performance!

Oracle – PL/SQL – Using ROW/TABLE Locks To Implement Application/Job Semaphore To Handle Race Conditions

What is a Semaphore? Instead of a clinical illustration of exclusive row lock and exclusive table lock usage in Oracle, here we will try to use them to highlight a higher level concept – Implement a semaphore mechanism. Wikipedia defines semaphore as below: In computer science, a semaphore is a variable or abstract data type … Continue reading Oracle – PL/SQL – Using ROW/TABLE Locks To Implement Application/Job Semaphore To Handle Race Conditions